Population ecology of Scandinavian wolverines
In this thesis I examine reproductive patterns, test for effects of reproductive costs and winter food availability on female reproduction, estimate rates and causes of juvenile mortality, examine dispersal patterns and analyze population viability. Wolverine (Gulo gulo) females reached the reproduc...
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Online Access: | https://pub.epsilon.slu.se/205/ https://pub.epsilon.slu.se/205/1/JPthesis.pdf |
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ftslunivuppsala:oai:pub.epsilon.slu.se:205 2024-06-09T07:46:31+00:00 Population ecology of Scandinavian wolverines Persson, Jens 2003-04 application/pdf https://pub.epsilon.slu.se/205/ https://pub.epsilon.slu.se/205/1/JPthesis.pdf eng eng https://pub.epsilon.slu.se/205/1/JPthesis.pdf Persson, Jens (2003). Population ecology of Scandinavian wolverines. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 262 ISBN 91-576-6346-7 [Doctoral thesis] Not in use please see Agris categories Doctoral thesis NonPeerReviewed 2003 ftslunivuppsala 2024-05-16T04:04:25Z In this thesis I examine reproductive patterns, test for effects of reproductive costs and winter food availability on female reproduction, estimate rates and causes of juvenile mortality, examine dispersal patterns and analyze population viability. Wolverine (Gulo gulo) females reached the reproductive stage no earlier than 3 years of age and the minimum average age at first reproduction was 3.4 years. Each year about every second female reproduced and produced an average of 0.8 kits per female. Reproduction incurred costs on females that affected reproduction the subsequent year. Experimental food-supplementation of females in early winter enhanced reproductive rates, even though all food-supplemented females had reproduced the preceding year. I therefore suggest that reproductive success of wolverine females is determined by the combined effect of reproductive costs and winter food availability. The survival rate of radio-marked juveniles from May to February was about 70%. Intraspecific predation was the most important cause of juvenile mortality (50%), and occurred in May-June when juveniles are dependent on their mother and in August-September after independence. Mean dispersal age was 13 (7-26) months for both sexes. All males (n = 11) and 69% of the females (n = 9) dispersed. Competition for resources apparently determined female dispersal pattern, while competition for mates seemed to explain male dispersal pattern. Population dynamics of wolverines are largely influenced by stochastic components. A population viability analysis suggest that the carrying capacity of a Scandinavian population should exceed 46 adult (≥3 years old) females to not be considered vulnerable according to IUCN (2000). This should be seen as a preliminary guideline as parameter estimates in the model are uncertain. The Swedish population averaged 100 adult females during 1999-2001, which is far above the carrying capacity recommended for a population to not be considered “vulnerable”. The recruitment rate to the next generation ... Doctoral or Postdoctoral Thesis Gulo gulo Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive |
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Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive |
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ftslunivuppsala |
language |
English |
topic |
Not in use please see Agris categories |
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Not in use please see Agris categories Persson, Jens Population ecology of Scandinavian wolverines |
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Not in use please see Agris categories |
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In this thesis I examine reproductive patterns, test for effects of reproductive costs and winter food availability on female reproduction, estimate rates and causes of juvenile mortality, examine dispersal patterns and analyze population viability. Wolverine (Gulo gulo) females reached the reproductive stage no earlier than 3 years of age and the minimum average age at first reproduction was 3.4 years. Each year about every second female reproduced and produced an average of 0.8 kits per female. Reproduction incurred costs on females that affected reproduction the subsequent year. Experimental food-supplementation of females in early winter enhanced reproductive rates, even though all food-supplemented females had reproduced the preceding year. I therefore suggest that reproductive success of wolverine females is determined by the combined effect of reproductive costs and winter food availability. The survival rate of radio-marked juveniles from May to February was about 70%. Intraspecific predation was the most important cause of juvenile mortality (50%), and occurred in May-June when juveniles are dependent on their mother and in August-September after independence. Mean dispersal age was 13 (7-26) months for both sexes. All males (n = 11) and 69% of the females (n = 9) dispersed. Competition for resources apparently determined female dispersal pattern, while competition for mates seemed to explain male dispersal pattern. Population dynamics of wolverines are largely influenced by stochastic components. A population viability analysis suggest that the carrying capacity of a Scandinavian population should exceed 46 adult (≥3 years old) females to not be considered vulnerable according to IUCN (2000). This should be seen as a preliminary guideline as parameter estimates in the model are uncertain. The Swedish population averaged 100 adult females during 1999-2001, which is far above the carrying capacity recommended for a population to not be considered “vulnerable”. The recruitment rate to the next generation ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Persson, Jens |
author_facet |
Persson, Jens |
author_sort |
Persson, Jens |
title |
Population ecology of Scandinavian wolverines |
title_short |
Population ecology of Scandinavian wolverines |
title_full |
Population ecology of Scandinavian wolverines |
title_fullStr |
Population ecology of Scandinavian wolverines |
title_full_unstemmed |
Population ecology of Scandinavian wolverines |
title_sort |
population ecology of scandinavian wolverines |
publishDate |
2003 |
url |
https://pub.epsilon.slu.se/205/ https://pub.epsilon.slu.se/205/1/JPthesis.pdf |
genre |
Gulo gulo |
genre_facet |
Gulo gulo |
op_relation |
https://pub.epsilon.slu.se/205/1/JPthesis.pdf Persson, Jens (2003). Population ecology of Scandinavian wolverines. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 262 ISBN 91-576-6346-7 [Doctoral thesis] |
_version_ |
1801376416813547520 |